Henry died an "ignomious death at the hands of the savage Mexicans" when he was executed following an 8-day battle. The filibuster expedition he was part of (led by Henry A. Crabb) fought a battle with Mexicans in the town of Cavores. The battle continued for eight days, at the end of which Crabb surrendered with 58 men. He was executed by firing squad the next day. [Source: Daily Alta California, Volume IX, Number 133, 14 May 1857]

Source: Crabb's Filibustering Expedition into Sonora, 1857 by Robert H. Forbes (1952)Source: History of Political Conventions in California, 1849-1892 by Winfield J. Davis (1893)